CN101202453B - Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current - Google Patents
Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current Download PDFInfo
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- CN101202453B CN101202453B CN2006101653015A CN200610165301A CN101202453B CN 101202453 B CN101202453 B CN 101202453B CN 2006101653015 A CN2006101653015 A CN 2006101653015A CN 200610165301 A CN200610165301 A CN 200610165301A CN 101202453 B CN101202453 B CN 101202453B
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Abstract
The invention relates to a circulation control method of a single-phase half-bridge inversion parallel DC, comprising the following steps: a sampling step samples the input current of DC/DC part; a calculating step calculates the different value between the sampling values of the input current of the DC/DC part; and a modulating step modulates the output voltage of the DC/AC. According to the different value which is obtained in the calculating step, the pulse width is adjusted and the duty cycle of a sine wave is modulated. The invention adjusts the output voltage, effectively controls the AC parallel system DC circulation and improves the reliability of the system by sampling the input current of the DC/DC part and taking the different value between the sampling current as a feedback of the output modulation of the DC/AC.
Description
Technical field
The present invention relates to the parallel type inversion field of power supplies, relate in particular to a kind of method and system of single-phase semi-bridge inversion parallel connection direct circulation control.
Background technology
Current, the ac power supply mode is developed to distributed, global function formula by centralized.By the power-supply system that a plurality of inversion units compose in parallel, become a very promising engineering application scheme.This parallel redundant system has following advantage: reliable, power bracket is wide, has very high system maintainability energy, when certain inversion unit breaks down, can change easily or keep in repair.
The fault of electric power system can't be avoided, and is the primary requirement of system's power supply so exchange the reliability and the fail safe of parallel system.Yet, in present parallel system, single-phase semi-bridge inversion parallel connection system particularly, because the reason of cost and system complexity etc., current transformer is adopted in the sampling of system's circulation control more.The AC signal because current transformer can only be sampled, so, the direct current component in system's circulation just can't be controlled effectively.Will cause following three adverse consequencess like this:
Parallel system by Alternating Current Power Supply the time, the input current imbalance of different units in parallel;
Parallel system when battery-powered, the battery discharge current imbalance of different units in parallel;
Have dc loop-current between the different units in the parallel system, long-term work has very big influence to the reliability of parallel system.
In above-mentioned three consequences, latter two influence to system is bigger.If the fault of electric power system takes place, exchanging parallel system transfers battery-powered, at this moment the battery discharge current imbalance of different units in parallel, it is very little the battery discharge current that certain inversion unit joined to occur, and other inversion unit institute distribution tank discharge is excessive, will cause exchanging in the parallel system discharge excessive certain or several inversion unit institute distribution ponds like this and shift to an earlier date discharge off, and the result that other inversion units work on causes the redundant deficiency of system even the loss of power accident of system overload.The dc loop-current that exists between the different units in the parallel system can make the output inductor heating of unit in parallel under the situation of system's long-term work, when serious even can burn inductance, cause the outage of system.
Summary of the invention
In order to solve above-mentioned technical problem, a kind of method of single-phase semi-bridge inversion parallel connection direct circulation control is provided, its purpose is, solves the problem that parallel system causes because of dc loop-current, improves the fail safe and the reliability that exchange parallel system.
The invention provides a kind of method of single-phase semi-bridge inversion parallel connection direct circulation control, may further comprise the steps:
Sampling step, the input current of sampling DC-DC part; Described DC-DC part input current is the passive power factor corrective inductive current of positive and negative bus;
Calculation procedure, the difference of the input current of calculating DC-DC part specifically comprises: the passive power factor corrective inductive current sampled value of described positive and negative bus is subtracted each other;
AC/DC output voltage regulating step according to the difference that described calculation procedure obtains, is adjusted the duty ratio of pulse width modulation sine wave.
Described AC/DC output voltage regulating step may further comprise the steps: if | I
L1-I
L2|＞Iref and I
L1＞I
L2, D then
+=D+Y; If | I
L1-I
L2|＞Iref and I
L1＜I
L2, D then
-=D+Y; Otherwise do not carry out the adjusting of the duty ratio of pulse width modulation sine wave; Wherein, I
L1Be the input current of positive direct-current/direct current component, I
L2Be the input current of negative DC-DC part, Iref is the difference of given inductive current, D
+Be the duty ratio of the positive half cycle of output voltage, D
-Be the duty ratio of output voltage negative half period, D is the amplitude limit value that duty ratio is adjusted for the duty ratio of the pulse width modulation sine wave before adjusting, Y.
In the described sampling step, the electric current sum of the fly-wheel diode of flowing through in the electric current of sample streams switching tube in the DC-DC part and the DC-DC part.
The present invention also provides a kind of system of single-phase semi-bridge inversion parallel connection direct circulation control, comprising:
Sampling module, DC-DC input current partly is used to sample; Described DC-DC part input current is the passive power factor corrective inductive current of positive and negative bus;
Computing module is used to calculate the difference of the input current of DC-DC part, specifically comprises: the passive power factor corrective inductive current sampled value of described positive and negative bus is subtracted each other;
AC/DC output voltage adjustment module according to the difference that described computing module obtains, is adjusted the duty ratio of pulse width modulation sine wave.
Described sampling module comprises switching tube and fly-wheel diode;
The drain electrode of described switching tube links to each other with an end of passive power factor corrective inductance, and the source ground of described switching tube, the grid of described switching tube connect the control end of the system of described single-phase semi-bridge inversion parallel connection direct circulation control;
The anode of described fly-wheel diode links to each other with an end of described passive power factor corrective inductance, and the negative electrode of described fly-wheel diode links to each other with an end of electric capacity, the other end ground connection of described electric capacity.
Described sampling module carries out the sampling of the passive power factor corrective inductive current of positive and negative bus by sample streams through the electric current and the fly-wheel diode electric current sum of described switching tube.
Described AC/DC output voltage adjustment module, when | I
L1-I
L2|＞Iref and I
L1＞I
L2The time, D then
+=D+Y; When | I
L1-I
L2|＞Iref and I
L1＜I
L2The time, D then
-=D+Y; Otherwise do not carry out the adjusting of the duty ratio of pulse width modulation sine wave; Wherein, I
L1Be the input current of positive direct-current/direct current component, I
L2Be the input current of negative DC-DC part, Iref is the difference of given inductive current, D
+Be the duty ratio of the positive half cycle of output voltage, D
-Be the duty ratio of output voltage negative half period, D is the amplitude limit value that duty ratio is adjusted for the duty ratio of the pulse width modulation sine wave before adjusting, Y.
The present invention is by the input current of sampling DC-DC (DC/DC) part, and with between the two the difference feedback that output is regulated as AC/DC (DC/AC), carry out the adjusting of output voltage, interchange parallel system dc loop-current is controlled effectively, has improved the reliability of system.
Description of drawings
Fig. 1 is the main circuit block diagram of single-phase semi-bridge inversion;
Fig. 2 is the main circuit topology schematic diagram of single-phase semi-bridge inversion;
Fig. 3 is PFC inductive current sampling principle figure;
Fig. 4 is the flow chart of the inventive method.
Embodiment
The method of single-phase semi-bridge inversion parallel connection direct circulation control of the present invention comprises:
The input current of step 1. sampling DC/DC part
The main circuit topology figure of single-phase semi-bridge inversion as shown in Figure 2.From main circuit topology figure as can be seen, DC/DC part input current I
1+And I
1-Be exactly passive power factor corrective (PFC) the inductive current I of positive and negative bus (BUS)
L1And I
L2Because I
L1Be not easy Direct Sampling, so adopt sample streams to carry out the sampling of the PFC inductive current of positive and negative BUS through the electric current of switching tube K1 and the method for sustained diode 1 electric current sum.Sampling module comprises switching tube K1 and sustained diode 1; The drain electrode of this switching tube K1 links to each other with an end of described PFC inductance, the source ground of described switching tube K1, the control end of the grid welding system of this switching tube K1; The anode of this sustained diode 1 links to each other with an end of this PFC inductance, and the negative electrode of this sustained diode 1 links to each other with an end of capacitor C 1, the other end ground connection of this capacitor C 1.Fig. 3 is the part in Fig. 2 frame of broken lines, is depicted as the PFC inductive current I of positive BUS
L1Sampling principle (I
L2Sampling and I
L1Similar):
I
L1＝I
k1+I
D1
In the practical application, can increase processing to the sampled value of inductive current.Herein, adopt the operational processes sampled data that sampled value is averaged.After sampled data handled, can make sampled value, reach better control effect more near actual value.
The input current difference of the DC/DC part that step 2. is calculated
The PFC inductive current sampled value of positive and negative BUS after handling is subtracted each other.
Step 3.DC/AC output voltage is regulated
Compare with given difference in the difference that step 2 the is calculated back that takes absolute value.If actual difference is bigger than given difference, then carry out the adjusting of the sinusoidal wave duty ratio of pulse width modulation (PWM), otherwise, do not regulate.Concrete conciliation method is as follows:
When | I
L1-I
L2| during＞Iref,
If I
L1＞I
L2, D then
+=D+Y
If I
L1＜I
L2, D then
-=D+Y
When | I
L1＜I
L2| during≤Iref, do not carry out the adjusting of the sinusoidal wave duty ratio of PWM.
As shown in Figure 2, wherein, I
L1Be the input current of positive DC/DC part, I
L2Be the input current of negative DC/DC part, Iref is the difference of given inductive current, D
+Be the duty ratio of the positive half cycle of output voltage, D
-Be the duty ratio of output voltage negative half period, D is the amplitude limit value that duty ratio is adjusted for the duty ratio of the PWM sine wave before adjusting, Y.
Method flow of the present invention as shown in Figure 4.At first to handle the sampled value of inductive current.Herein, adopt the operational processes sampled data that sampled value is averaged.Then, the PFC inductive current sampled value of the positive and negative BUS after will handling is again subtracted each other, and compares with given difference after difference takes absolute value.If actual difference is bigger than given difference, then carry out the adjusting of the sinusoidal wave duty ratio of PWM, otherwise, do not regulate.
The present invention also provides a kind of system of single-phase semi-bridge inversion parallel connection direct circulation control, comprising:
Sampling module, the PFC inductive current of the positive and negative BUS of DC-DC part that is used to sample input current;
Computing module is used for the difference between the PFC inductive current sampled value of the described positive and negative BUS after the computing;
AC/DC output voltage adjustment module according to the difference that described calculation procedure obtains, is adjusted the duty ratio of pulse width modulation sine wave.
This sampling module comprises switching tube and fly-wheel diode.The drain electrode of this switching tube links to each other with an end of described PFC inductance, the source ground of this switching tube, the control end of the grid welding system of this switching tube.The anode of this fly-wheel diode links to each other with an end of this PFC inductance, and the negative electrode of this fly-wheel diode links to each other with an end of electric capacity, the other end ground connection of this electric capacity.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but determine by the scope of claims.
Claims (7)
1. the method for a single-phase semi-bridge inversion parallel connection direct circulation control is characterized in that, may further comprise the steps:
Sampling step, the input current of sampling DC-DC part; Described DC-DC part input current is the passive power factor corrective inductive current of positive and negative bus;
Calculation procedure, the difference of the input current of calculating DC-DC part specifically comprises: the passive power factor corrective inductive current sampled value of described positive and negative bus is subtracted each other;
AC/DC output voltage regulating step according to the difference that described calculation procedure obtains, is adjusted the duty ratio of pulse width modulation sine wave.
2. the method for single-phase semi-bridge inversion parallel connection direct circulation control as claimed in claim 1 is characterized in that described AC/DC output voltage regulating step may further comprise the steps: if | I
L1-I
L2|＞Iref and I
L1＞I
L2, D then
+=D+Y; If | I
L1-I
L2|＞Iref and I
L1＜I
L2, D then
-=D+Y; Otherwise do not carry out the adjusting of the duty ratio of pulse width modulation sine wave; Wherein, I
L1Be the input current of positive direct-current/direct current component, I
L2Be the input current of negative DC-DC part, Iref is the difference of given inductive current, D
+Be the duty ratio of the positive half cycle of output voltage, D
-Be the duty ratio of output voltage negative half period, D is the amplitude limit value that duty ratio is adjusted for the duty ratio of the pulse width modulation sine wave before adjusting, Y.
3. the method for single-phase semi-bridge inversion parallel connection direct circulation control as claimed in claim 1 is characterized in that, in the described sampling step, and the electric current sum of fly-wheel diode in the electric current of sample streams switching tube in the DC-DC part and the DC-DC part of flowing through.
4. the system of a single-phase semi-bridge inversion parallel connection direct circulation control is characterized in that, comprising:
Sampling module, DC-DC input current partly is used to sample; Described DC-DC part input current is the passive power factor corrective inductive current of positive and negative bus;
Computing module is used to calculate the difference of the input current of DC-DC part, specifically comprises: the passive power factor corrective inductive current sampled value of described positive and negative bus is subtracted each other;
AC/DC output voltage adjustment module according to the difference that described computing module obtains, is adjusted the duty ratio of pulse width modulation sine wave.
5. the system of single-phase semi-bridge inversion parallel connection direct circulation control as claimed in claim 4 is characterized in that described sampling module comprises switching tube and fly-wheel diode;
The drain electrode of described switching tube links to each other with an end of passive power factor corrective inductance, and the source ground of described switching tube, the grid of described switching tube connect the control end of the system of described single-phase semi-bridge inversion parallel connection direct circulation control;
The anode of described fly-wheel diode links to each other with an end of described passive power factor corrective inductance, and the negative electrode of described fly-wheel diode links to each other with an end of electric capacity, the other end ground connection of described electric capacity.
6. the system of single-phase semi-bridge inversion parallel connection direct circulation control as claimed in claim 5, it is characterized in that described sampling module carries out the sampling of the passive power factor corrective inductive current of positive and negative bus by sample streams through the electric current and the fly-wheel diode electric current sum of described switching tube.
7. the system of single-phase semi-bridge inversion parallel connection direct circulation control as claimed in claim 4 is characterized in that, described AC/DC output voltage adjustment module, when | I
L1-I
L2|＞Iref and I
L1＞I
L2The time, D then
+=D+Y; When | I
L1-I
L2|＞Iref and I
L1＜I
L2The time, D then
-=D+Y; Otherwise do not carry out the adjusting of the duty ratio of pulse width modulation sine wave; Wherein, I
L1Be the input current of positive direct-current/direct current component, I
L2Be the input current of negative DC-DC part, Iref is the difference of given inductive current, D
+Be the duty ratio of the positive half cycle of output voltage, D
-Be the duty ratio of output voltage negative half period, D is the amplitude limit value that duty ratio is adjusted for the duty ratio of the pulse width modulation sine wave before adjusting, Y.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101653015A CN101202453B (en) | 2006-12-15 | 2006-12-15 | Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101653015A CN101202453B (en) | 2006-12-15 | 2006-12-15 | Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current |
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| Publication Number | Publication Date |
|---|---|
| CN101202453A CN101202453A (en) | 2008-06-18 |
| CN101202453B true CN101202453B (en) | 2010-09-01 |
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|---|---|---|---|
| CN2006101653015A Expired - Fee Related CN101202453B (en) | 2006-12-15 | 2006-12-15 | Method and system for controlling single-phase semi-bridge inversion parallel connection direct current circulating current |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8482156B2 (en) * | 2009-09-09 | 2013-07-09 | Array Power, Inc. | Three phase power generation from a plurality of direct current sources |
| TWI499164B (en) * | 2011-04-07 | 2015-09-01 | Chao Cheng Lu | Cell interface |
| CN102231608B (en) * | 2011-07-04 | 2013-08-07 | 浙江大学 | DC (direct current) loop-current suspension device for inverter parallel system |
| CN102957313B (en) * | 2012-11-05 | 2015-02-25 | 华为技术有限公司 | Non-isolated direct current (DC)/DC ground wire current equalizing circuit |
| CN103001521B (en) * | 2012-12-27 | 2014-10-29 | 哈尔滨工业大学 | Circulating-current restraining method of multi-converter parallel connection system based on zero sequence current dead beat control |
| CN103441673B (en) * | 2013-08-20 | 2016-01-20 | 东莞市力与源电器设备有限公司 | A kind of multimode parallel operation method of high-power positive and negative commutating pulse power supply |
| CN107302300B (en) * | 2017-06-15 | 2019-02-22 | 温州大学 | A kind of parallel system Balance route departure acquisition circuit based on PWM filtering |
| CN110190768B (en) * | 2018-02-22 | 2020-12-08 | 固纬电子实业股份有限公司 | DC-AC converter and parallel current-sharing control method thereof |
| CN111464001B (en) * | 2019-01-18 | 2021-06-11 | 台达电子企业管理（上海）有限公司 | Method and system for reducing input circulating current of multiple non-isolated modules operating in parallel |
| CN111342444B (en) * | 2020-04-03 | 2024-03-19 | 西安清泰科新能源技术有限责任公司 | Switching ripple circulation suppression device and method for DC power supply system |
| CN112366970B (en) * | 2021-01-14 | 2021-04-02 | 深圳市正浩创新科技有限公司 | Inversion system, inversion system control method and parallel inversion system |
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2006
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|---|---|---|---|---|
| CN1395348A (en) * | 2001-06-29 | 2003-02-05 | 三洋电机株式会社 | System connection power generator and control method thereof |
| CN1490915A (en) * | 2002-10-18 | 2004-04-21 | 艾默生网络能源有限公司 | Parallel single-phase DC-to-AC converter systems |
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| Title |
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